<template>
  <div class="app-container">
    <!-- 顶部 Header 区域 -->
    <mt-header fixed title="TEST.Vue项目">
			<span  slot="left" @click="goBack" v-show="flag">
				<mt-button icon="back">返回</mt-button>
			</span>
		</mt-header>

    <!-- 中间 路由 router-view 区域 -->
		<transition>
			<router-view></router-view>
		</transition>


    <!-- 底部 Tabbar 区域 -->
    	<nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-lib " to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart">
					<span class="mui-badge" id="badge">{{ $store.getters.getAllCount }}</span></span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>

  </div>
</template>

<script>
  export default {
		data(){
			return { 
				flag: false  //返回按钮可见性标识位（首页的化则不可见）
				}
		},
		methods:{
			goBack(){
				// 点击后退
				this.$router.go(-1)
			}
		},
		created(){
			this.flag = this.$route.path == '/home' ? false : true
		},
		watch:{
			// 监听路由，如果是首页则返回按钮不可见
			'$route.path' : function(newVal){
				if(newVal == '/home'){
					this.flag = false
				}else{
					this.flag = true
				}
			}
		}
	}
</script>


<style lang="scss" scoped>
.mint-header{
	z-index: 99;  //设置层级高一些，防止 router-view 区域的内容覆盖到head区域内容
}
.app-container {
  padding-top: 20px;
	padding-bottom: 50px;
	overflow-x: hidden;
}

/* 组件切换动画 */
.v-enter {
	opacity: 0;
	transform: translateX(100%);
}
.v-leave-to {
	opacity: 0;
	transform: translateX(-100%);
	position: absolute;  //解决页面进入时向上跳动问题
}

.v-enter-active,
.v-leave-active{
	transition: all 0.5s ease;
}

// 改类名，解决tabbar点击无法切换的问题（mui-tab-item >> mui-tab-item-lib）
.mui-bar-tab .mui-tab-item-lib.mui-active {
    color: #007aff;
}
.mui-bar-tab .mui-tab-item-lib {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}
.mui-bar-tab .mui-tab-item-lib .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}
.mui-bar-tab .mui-tab-item-lib .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}


</style>

